98 REPORT OF N^EW JERSEY STATE MUSEUM. 



Genus PHILORTHRAGORISCUS Horst. 



Philorthragoriscus Horst, Notes Leyd. Mus., XIX, 1897, p. 137. Type Dinem- 

 atiira serrata Kroyer, monotypic. 



Female. — Carapace well rounded, a little wider than long. 

 First thorax segment only fused with head, second and third 

 segments fused inter se and furnished with pair of small lateral 

 plates, and fourth segment with pair of large dorsal plates fully 

 wide as carapace and overlapping three-fifths of genital segment. 

 Latter nearly size of carapace, covered by pair of large dorsal 

 plates with finely serrated edges. Abdomen small, wdder than 

 long, one-jointed, attached to genital segment so far forward as 

 almost entirely concealed in dorsal view. Anal laminae large, 

 foliaceouis, divergent, each armed with four short spines. Frontal 

 plates well fused with carapace. First antennse long, two- 

 jointed. Second pair three- jointed, uncinate. Mouth-tube long, 

 pointed. Mandibles with very wide blunt teeth. Second maxilloe 

 short, jointed, simple. Second maxillipeds large, with stout 

 terminal claw. All swimming-legs biramose. Rami of first 

 three pairs two-jointed, armed with both spines and plumose 

 setae, rami of fourth pair one-jointed and bearing short spines 

 only. Fifth pair of swimming-legs entirely lacking. Egg-tubes 

 straight or coiled outside body, several times body length. Eggs 

 as in Pandarince. 



Male. — Carapace much larger than rest of body, wider than 

 long, its dorsal surface grooved as in Pandarincc. No eyes 

 visible. Second and third thorax segments fused inter se, 

 furnished with pair of small lateral plates. Fourth segment with 

 pair of very small and rudimentary dorsal plates which scarcely 

 overlap genital segment at all. Genital segment subquadrangu- 

 lar, with slightly rounded sides, covered with two dorsal plates 

 thoroughly fused along mid-line, with posterior margin and 

 sinus exactly as in Perissopus. Abdomen shaped as in female 

 but more of it visible behind genital segment. Anal laminae 

 narrow^er and smaller than in other sex, each armed with three 

 good-sized setae. First antennae relatively longer than in female. 

 Second pair also enlarged, their terminal claws projecting well 



